Malicious PDF — malware analysis report

Static analysis result for SHA-256 00af438eba5d0ac2…

MALICIOUS

PDF

98.4 KB Created: 2020-08-09 11:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88411227948e7e8af88b0c0abecda06a SHA-1: 0ad406bea4db621b9bc7e7ed0cda7d89e0a6f43d SHA-256: 00af438eba5d0ac2c5aedec7fc493ac317d9bfc44c604bd0ba58605a44bca23d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Beclometasona efectos adversos pdf' and references 'wkhtmltopdf', suggesting a lure for search engine optimization or phishing. The presence of a large number of external PDF links further supports the SEO poisoning or link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=beclometasona+efectos+adversos+pdf
    • http://files.livingassistancefund.org/uploads/1/3/0/7/130738785/3fce59f.pdf
    • http://files.moskatero.org/uploads/1/3/2/3/132303269/jugolefonunugadaj.pdf
    • http://jinumu.shootlikeagirlllc.com/uploads/1/3/0/8/130874493/kepijonefofesarutis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/1330/7541/files/best_data_structures_and_algorithms_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/7195/3301/files/gewidunun.pdf
    • https://cdn.shopify.com/s/files/1/0436/0830/9923/files/pafozaboredunalamebax.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3899/files/kuwas.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/70346444346.pdf
    • https://cdn.shopify.com/s/files/1/0430/5112/2842/files/63080411669.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vinupagudesezubinu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/zafovotew.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/detailed_lesson_plan_in_english_adjectives.pdf
    • https://cdn.shopify.com/s/files/1/0432/6640/8603/files/talk_about_yourself_in_english_example.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3447/files/56653159849.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/42510648362.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013906.bin
d97d2fc6ca50b380f79d103b0f570f42985fcb93c8629a0f9a650b341cef12be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13906 5148 bytes
font_01_sfnt_off00014a6f.bin
34b1aa72b900c5f44c14076a441b2b3ba751eece1f7f8986cfad6009ea160e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6F 10368 bytes
font_02_sfnt_off00016de2.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE2 4324 bytes

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